EXPERIMENTAL STUDY ON ABRASION COUNTERMEASURES USING SELF LINING OF SEDIMENT BETWEEN TRIANGULAR STRIP ROUGHNESS ELEMENTS

Abstract

 We investigated the flow structure and the sediment deposition rate between triangle roughness elements to reveal the effect of the roughness interval on the self-lining of sediments. The two kinds of flume experiments (cases) were conducted by changing the roughness intervals and channel slope. First, we examined the sediment deposition between roughness elements and evaluated the coverage rate by self-lining using a video camera. The results revealed the experimental cases that the sediments were deposited successfully between roughness elements. Next, PIV measurements were conducted during the sedimentation experiments. We revealed that the strong downward flow occurs at the point where the flow depth becomes smaller. The sediments were flushed by a sweep for large Froude number case.